State your observation: At the cathode when acidified aq. CuSO₄ soln. is electrolysed with copper electrodes.

State which electrode: anode or cathode is the oxidizing electrode. Give a reason for the same.

The observation seen when fused lead bromide is electrolysed is:

1. a silver grey deposit at anode and a reddish brown deposit at cathode.
2. a silver grey deposit at cathode and a reddish brown deposit at anode.
3. a silver grey deposit at cathode and reddish brown fumes at anode.
4. silver grey fumes at anode and reddish brown fumes at cathode.

During electroplating an article with silver, the electrolyte used is:

1. silver nitrate solution
2. silver cyanide solution
3. sodium argentocyanide solution
4. nickel sulphate solution